from The American Heritage® Dictionary of the English Language, 4th Edition

  • Four: tetrode.
  • Containing four of a specified kind of atom, radical, or group: tetrachloride.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • Forming compound words having the sense of ‘four’.

from the GNU version of the Collaborative International Dictionary of English

  • A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.
  • A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.

from The Century Dictionary and Cyclopedia

  • n. A prefix in compounds derived from the Greek, signifying ‘four’: as, tetrachord, tetragon, tetrarch, tetramerous, tetrapetalous, tetraspermous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. brightly colored tropical freshwater fishes


(American Heritage® Dictionary of the English Language, Fourth Edition)
From combining form of Ancient Greek τέτταρες (tettares), τέσσαρες (tessares, "four"). (Wiktionary)


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